Hi there ~
I would ask your doctor what the culture report on the fluid that was sent after aspirating from your knee was? If it was not bacterial or anything that needed antibiotics either in your blood or in your knee, I would think that the knee replacement
can take place. However, please take a second opinion
for the TKR if you are not entirely sure of the first one. I hope you are not in pain and my answer relieved your anxiety
Take care and have a lovely day !